[Autofill] Removes an unnecessary call to the string16 constructor.

Bug: 955638

Change-Id: I375ca09f4c117ad35b84a85c97dae9702d8b534a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1579521Reviewed-by: Tommy Martino <tmartino@chromium.org>
Commit-Queue: Caitlin Fischer <caitlinfischer@google.com>
Cr-Commit-Position: refs/heads/master@{#653357}

components/autofill/core/browser/suggestion_selection.cc

@@ -228,8 +228,8 @@ void PrepareSuggestions(bool contains_address,
   DCHECK_EQ(suggestions->size(), labels.size());
 
   for (size_t i = 0; i < labels.size(); ++i) {
-    (*suggestions)[i].additional_label = base::string16(labels[i]);
-    (*suggestions)[i].label = base::string16(labels[i]);
+    (*suggestions)[i].additional_label = labels[i];
+    (*suggestions)[i].label = labels[i];
 
 #if !defined(OS_ANDROID) && !defined(OS_IOS)
     if (base::FeatureList::IsEnabled(